Theophile dill-richard



(No Model.)

T. BILL-RICHARD. ANGLE ATTACHMENT FOR, DENTAL HANDPIEGES.

No. 565,533. Patented Aug. 11, 1896.

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UNITED STATES PATENT OFFICE.

THEOPHILE DILL-RIOHARD, OF LIESTAL, SWITZERLAND.

ANGLE ATTACHMENT FOR DENTAL HANDPIECES.

SPECIFICATION forming part of Letters Patent No. 565,533, dated August 11, 1896.

Ap licati n fil d August 3, 1894. $erial No. 519,346. (No model.) Patented in Switzerland May 4, 1894, No. 8,354; in Belgium May 15,1894,No. 109,961; in France May15, 1894,No. 238,533; in Germany May1'7, 1894, No. 78,282; in England May 28, 1894,11'0. 10,338; in Austria June 19, 1894, No. 44/3,514, and in Italy August 13,1894, XXIX, 36,840,

LXXII, 229.

To all whom, it may concern:

Be it known that I, THEOPHILE BILL-RICH- ARD, a citizen of the Swiss Republic, residing at Liestal, in the Canton of Basle, Switzerland, have invented a new and useful Tool- Holder for Dental-Engine Handpieces and Analogous Implements, (which invention is patented in Switzerland, No. 8,354, dated May 4, 1894; in Great Britain, No. 10,338, dated May28, 1894; in Austria, No. 44/3,514, dated June 19, 1894; in Belgium, No. 109,961, dated May 15, 1894; in France, No. 238,533, dated May 15, 1894; in Germany, No. 78,282, dated May 17, 1894, and in Italy, R. G., XXIX, No. 36,840, R. A., LXXII, No. 229, dated August 13, 1894,) of which the following is a specification.

This invention relates to tool-holders for dental-engine handpieces and analogous implements, and is especially applicable to angle attachments for such devices.

The angular handpieces or tool holders generally used for holding and guiding the tools of dental engines or drilling-machines, such as drills, burs, burnishers, and rotary brushes, are attended with the inconvenience that, while the tool is in operation, the enamel and bone-dust penetrating between the contact-surfaces of the revolving chuck or clamping-collar carrying the tool and the stationary handpiece-frame is apt, owing to the great speed with which the tool revolves, rapidly to wear out those parts, however carefully they may be lubricated, with the result that the said clamping-collar or chuck soon becomes loose in its frame or holder, and that consequently the tool gets out of center and will no longer work as accurately and safely as it is required to do, and the handpiece itself becomes unfit for further use. Another disadvantage of the old arrangement is this that the one, cylindrical, end of the tool is usually fitted in the said chuck by inserting it between the slightly resilient cheeks of the same and securing it by a kind of bayonet-j oint, so that the tool is not held with sufficient security and accuracy even in the chuck. To remedy these drawbacks, an improved angular handpiece has been devised, the construction of which forms the subject of this invention, according to the preferred form of which the chuck or socket-piece which receives the tool in the improved arrangement rests with its two conical ends one within two correspondingly-beveled bearings of the angular handpiece, one of which bearings is on an adj ustable piece, non-rotative relatively to the handpiece, and a resilient nut is provided for adjusting this bearing, which permits the gradual wear to be compensated in proportion as it takes place. In addition to this, the end of the tool which is to be fitted in the chuck or socket is tapered, as is also the bore provided for its reception in the socket-piece, so that the external pressure to which the tool is subjected tends to press it more firmly into the said socket. To render the position of the tool in the socket still more secure, it may be threaded at the end which the socket-piece is to receive, the latter being correspondingly tapped and the connection being consequently produced by screwing, which will effectually preclude the tool from becoming loose of its own accord.

The invention will be best understood by reference to the accompanying drawings, of which Figure 1 is a fragmentary axial section of a rectangular handpiece constructed in accordance with this invention and having a bur fitted to it in longitudinal section. Fig. 2 is a cross-section along line X X of Fig. 1.

Fig. 3 also shows the angular handpiece,'

though only in dotted lines, as attached to one of Shaws dental engines; and Figs. 4 and 5 show, respectively, an acute-angled and an obtuse-angled handpiece embodying the same principle as that which Figs. 1 and 2 illustrate.

It will be seen from the drawings that, as usual, the casing A of the handpiece may be arranged on the fastening-tube B either at a right angle, acute angle, or obtuse angle. This tube B, which serves for fastening the angle-piece to the straight handpiece II of the dental engine, is slid onto the front part of the latter and retained therein by means of a spring-con trolled hook or by a bayonet-joint. In the center of the tube 13 there is arranged a spindle C, one end of which is provided with a flattened portion 0, adapted when the anglepiece is fitted in position to come into contact with another similar fiat face formed on the spindle C, Fig. 1, which terminates in the straight piece H and is operated by the driving mechanism of the drill, by which contact of flat surfaces one spindle is carried round by the other as it revolves. Upon the opposite end of the said spindle 0 there is mounted a gear-wheel D, which extends into the casing A and is in gear with the other gear-wheel E, secured to the socket-piece F, which is to receive the tool. According to one feature of improvement this socket-piece F has a con ical bore f, of which the lower and narrower part, however, is of cylindrical shape and tapped with an inner screw-thread, so that the conical threaded portion 9 of the shank g of the tool G, in being inserted into the socket-piece F, may be firmly secured therein by screwing, thereby obviating any tendency of the tool to become loose accidentally. To facilitate the removal of the tool G from its socket when required, the lower end of such tool is provided with a notch 9 in which a screw-driver can engage. If desired, the threaded portion 9 of the tool G may be dispensed with, as sufficient firmness may be insured by simply fitting the conical shank g of such tool into the correspondingly-shaped bore of the socket-piece F, the firmness of the connection being enhanced, as before stated, by the external strains which the said tool sustains.

The beveled oblique end f of the socketpiece F turns Within a correspondingly-beveled recess of the aperture a, formed in the bottom a of the casing, while the upper beveled portion f 2 of the said socket-pieceF bears, according to another feature of improvement, on a conically-hollowedbut disk I. This disk is loosely inserted into the casing A open at the top,and a notch which is provided in its periphery, wherein en gages a projection (t raised on the casin g A, prevents this disk from turning. The said disk, according to another feature of improvement, is pressed against the conef by the nut J, screwed onto the open end of the casing A, which is threaded externally for the purpose, the body part of such nut engaging and covering the said disk I, owing to which arrangement, as the conical surfaces wear off, it is only necessary to tighten the said nut I to compensate for the wear, so that within the limit of the movement of the nut in no case need the socket-piece F become loose in the casing A. The cylindrical edge or flange of the nut J is provided with slots j, so that this edge or flange is resilient and tightlygrasps the casing A, thereby obviating any spontaneous rotation.

The casing A may be filled with a suitable lubricant, when all the revolving parts will be automatically lubricated while in operation, and no escape of the oil from the casing A need be feared.

What I claim, and desire to secure by Letters Patent of the United States, is-

1. In a handpiece for dental engines and analogous implements, the combination with a member having a handle portion and a casing having an open and a closed end disposed angularly to said handle portion and having a tapered or beveled bearing in its closed end and a screw-thread adjacent to its open end, of a sleeve F for receiving and holding a tool, rotatively inclosed in said casing and having near its ends tapering bearings, the one e11- gaging said bearing of said casing, and the other near the open end of the latter, means within said casing for driving said sleeve, an axially-adjustable bearing-piece I having a tapering bearing-face near the open end of said casing engaging the adjacent bearing of said sleeve and adjustable toward the other bearing of said casing to adjust the bearings of said sleeve, and a resilient nut J engaging adjusting and holding said bearing-piece in position, having a screw-thread screwing on that of said casing, and frictionally resisting its own adjustment, substantially as and for the purpose set forth.

2. Ahandpiece for dental engines and an alogous implements, comprising a rotary sleeve Freceiving the tool and having tapered portions adjacent to its opposite ends, in combination with a casing A inclosing said sleeve and formed at one end with a tapered bearing a receiving one tapered portion of the sleeve, open at its other end and there having a groove t and a screw-thread, an adjustable non-rotative bearing-piece I fitting in the open end of said casing and having a tapered portion receiving the other tapered portion of said sleeve, having a lateral projection (t entering and movable in said groove, and thereby preventing rotation of said bearing-piece in said casing, and an adj ustin g-nut at the outer side of said bearing-piece engaging and adjusting thelatter and screwing on said casing, whereby the bearings for said sleeve can be adj usted by said nut, and such adjustment cannot be impaired by the rotation of the sleeve.

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

THEOPHILE DILL-RICHARD.

Witnesses:

GEORGE GIFFORD, Ant [AND RITTERY. 

